When I perform a hanging hair test (HHT) using my own hair, it almost always fails. I have a full head of hair, but the individual hairs are fine. On the other hand, if I use one of my wife's hairs, which are easily found on the bathroom floor, the HHT is almost always successful. Compared to me, her hair is course.
So am I cheating? Should I expect the HHT to be robust and work for all types (diameter) of hair?